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<p>I think that entirely depends on the person. Some people (such as myself) are perfectly content with 4±year-old technology as long as it still works fine. I’ll shell out big bucks for quality electronics, but then keep them for 5-7 years.</p>
<p>For the record, my macbook is 5 years old and I have had no problems whatsoever with it aside from having to replace the CD drive–which they did at the Apple store for free. Couldn’t be happier with my Mac. 
My PC got viruses all the time. Maybe it’s because I’m a n00b but considering I am not a computer GEEK (and have no desire to spend the time or energy becoming one) I am happy to be virus-free. It’s not like I was going on different shady websites on the PC vs. the Mac; in fact, I probably go on sketchier sites now than I did as a fourth-grader with a PC. YMMV.</p>